BOSS Audio Systems B12ES 12 Inch Powered Car Subwoofer Package - 600 Watts Max, Built-In Amplifier, Low Profile, Remote Subwoofer Control (16 ft Cable) - Walmart.com
Subwoofer with Fs<16Hz - Techtalk Speaker Building, Audio, Video Discussion Forum
RSL Speedwoofer 12S Subwoofer Digs Deep to 16Hz for Only $800?!? | Audioholics